"The girl was just over eight when she got pregnant. The father is a boy who is 17, but we have not found him, since he ran away," the mother of the girl, identified only as Dafne, told local officials in Jalisco state.

"We are looking for the young man to get his story because she does not understand what has happened. This is a rape or child sex abuse case," said Jorge Villasenor with the state prosectors' office.

The baby girl was born January 27 in Zoquipan Hospital, weighing 2.7 kilos (5.7 lbs). Both girls were released from the hospital over the weekend, apparently doing well, but the hospital said it would have to do extensive followup due to the new mother's age.